source: mainline/kernel/arch/sparc64/src/mm/sun4v/frame.c@ a35b458

/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup sparc64mm
 * @{
 */
/** @file
 */

#include <arch/mm/frame.h>
#include <mm/frame.h>
#include <arch/boot/boot.h>
#include <typedefs.h>
#include <config.h>
#include <align.h>
#include <macros.h>

/** Create memory zones according to information stored in memmap.
 *
 * Walk the memory map and create frame zones according to it.
 */
static void frame_common_arch_init(bool low)
{
        unsigned int i;

        for (i = 0; i < memmap.cnt; i++) {
                uintptr_t base;
                size_t size;

                /*
                 * The memmap is created by HelenOS boot loader.
                 * It already contains no holes.
                 */

                /* To be safe, make the available zone possibly smaller */
                base = ALIGN_UP((uintptr_t) memmap.zones[i].start, FRAME_SIZE);
                size = ALIGN_DOWN(memmap.zones[i].size -
                    (base - ((uintptr_t) memmap.zones[i].start)), FRAME_SIZE);

                if (!frame_adjust_zone_bounds(low, &base, &size))
                        continue;

                pfn_t confdata;
                pfn_t pfn = ADDR2PFN(base);
                size_t count = SIZE2FRAMES(size);

                if (low) {
                        confdata = pfn;
                        if (confdata == ADDR2PFN(KA2PA(PFN2ADDR(0))))
                                confdata = ADDR2PFN(KA2PA(PFN2ADDR(2)));

                        zone_create(pfn, count, confdata,
                            ZONE_AVAILABLE | ZONE_LOWMEM);
                } else {
                        confdata = zone_external_conf_alloc(count);
                        if (confdata != 0)
                                zone_create(pfn, count, confdata,
                                    ZONE_AVAILABLE | ZONE_HIGHMEM);
                }
        }
}


void frame_low_arch_init(void)
{
        if (config.cpu_active > 1)
                return;

        frame_common_arch_init(true);

        /*
         * On sparc64, physical memory can start on a non-zero address.
         * The generic frame_init() only marks PFN 0 as not free, so we
         * must mark the physically first frame not free explicitly
         * here, no matter what is its address.
         */
        frame_mark_unavailable(ADDR2PFN(KA2PA(PFN2ADDR(0))), 1);

        /* PA2KA will work only on low-memory. */
        end_of_identity = PA2KA(config.physmem_end - FRAME_SIZE) + PAGE_SIZE;
}

void frame_high_arch_init(void)
{
        if (config.cpu_active > 1)
                return;

        frame_common_arch_init(false);
}

/** @}
 */